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Discussion Starter · #1 ·
where does the vacuum hose off the optispark go to.
it was a vent on the earlier models of the lt-1. starting in 95 or 96 they ran a vacuum hose to them to remove moisture.
 
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Discussion Starter · #2 ·
Good question, it should just plug into the intake somewhere. But, I not sure where it needs to be exactly.

Here's a few links where you may be able to find the info and alot more.

Good luck!
 

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Nowhere, Its A Vent


Hmm....it is a form of a vent but they are connected to the INTAKE MANIFOLD on the driver side. Inline (in between one of the 2 rubber opti hoses) there is a blue check valve/diaphram. So to make a long story short, 2 lines from the earlier opti sparks, one goes to the intake boot on top with a blue angle plug.....and the second line goes directly into the driver side on the intake manifold.....thats the line that has the blue check valve in it.
 
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